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Stock-Based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2012
Summary of Company Estimated Grant-date Fair Value of Stock Options Granted Using Black-Scholes Option Valuation Model | The Company estimated the grant-date fair value of stock options granted using the Black-Scholes option valuation model with the following assumptions:
|  | 2011 |
Expected dividend yield |  |  | 0.0% |
Expected volatility |  |  | 47.2% |
Risk-free interest rate |  |  | 2.4%-2.9% |
Expected life |  |  | 6.5 years |
Summary of Stock-based Compensation Expense | Stock-based compensation expense is summarized as follows:
|  | Years Ended December 31, |
|  | 2012 |  |  | 2011 |  |  | 2010 |
($ in thousands) |  |  |  |  |  |  |  |  |
Stock-based compensation expense |  | $ | 6,927 |  |  | $ | 5,625 |  |  | $ | 3,894 |
Summary of Stock Option Activity | Stock option activity for the year ended December 31, 2012 is summarized as follows:
|  | Number of shares |  |  | Weighted Average Exercise Price |
Outstanding at December 31, 2011 |  |  | 352,942 |  |  | $ | 20.21 |
Granted |  |  | — |  |  | $ | — |
Exercised |  |  | (130,304 | ) |  | $ | 20.23 |
Forfeited |  |  | (2,289 | ) |  | $ | 37.01 |
Outstanding at December 31, 2012 |  |  | 220,349 |  |  | $ | 20.03 |
Vested and exercisable at December 31, 2012 |  |  | 195,380 |  |  | $ | 18.31 |
Options expected to vest at December 31, 2012 |  |  | 21,985 |  |  | $ | 33.49 |
Summary of Restricted Stock Units Activity | RSU activity for the year ended December 31, 2012 is summarized as follows:
|  | Number of shares |  |  | Weighted Average Grant Date Fair Value |
Outstanding at December 31, 2011 |  |  | 576,704 |  |  | $ | 24.16 |
Granted |  |  | 102,531 |  |  | $ | 81.47 |
Forfeited |  |  | (4,907 | ) |  | $ | 50.12 |
Settled |  |  | (382,271 | ) |  | $ | 13.52 |
Outstanding at December 31, 2012 |  |  | 292,057 |  |  | $ | 57.89 |

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- Definition Disclosure of the number and weighted-average grant date fair value for restricted stock and restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock and restricted stock units that were granted, vested, or forfeited during the year. + References No definition available. + Details
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- Definition Tabular disclosure of the number and weighted-average exercise prices (or conversion ratios) for share options (or share units) that were outstanding at the beginning and end of the year, vested and expected to vest, exercisable or convertible at the end of the year, and the number of share options or share units that were granted, exercised or converted, forfeited, and expired during the year. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Stock Based Compensation Expense Table [Text Block] + References No definition available. + Details
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